I just finished installing two SSL certificates for two separate domains on my server running ISP Config. Installing the certificates is not hard. However, installing the "Intermediate Certificate" requires someone who can edit the Apache ssl.conf file. This step was beyond me -- it's a good thing I have a friend who is a Linux Sys Admin. It would make it far easier to have something in ISPConfig to install this. It only needs to be done once, even if there is more than one domain with an SSL installed.